/*
 * MIT License
 *
 * Copyright (c) 2023 北京凯特伟业科技有限公司
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.je.bpm.core.process.validation.validator.impl;

import com.je.bpm.core.model.*;
import com.je.bpm.core.model.process.Process;
import com.je.bpm.core.model.event.StartEvent;
import com.je.bpm.core.process.validation.ValidationError;
import com.je.bpm.core.process.validation.validator.Problems;
import com.je.bpm.core.process.validation.validator.ProcessLevelValidator;

import java.util.ArrayList;
import java.util.List;

/**
 *
 */
public class StartEventValidator extends ProcessLevelValidator {

    @Override
    protected void executeValidation(BpmnModel bpmnModel, Process process, List<ValidationError> errors) {
        List<StartEvent> startEvents = process.findFlowElementsOfType(StartEvent.class, false);
        validateEventDefinitionTypes(startEvents, process, errors);
        validateMultipleStartEvents(startEvents, process, errors);
    }

    protected void validateEventDefinitionTypes(List<StartEvent> startEvents, Process process, List<ValidationError> errors) {
        for (StartEvent startEvent : startEvents) {
            if (startEvent.getEventDefinitions() != null && !startEvent.getEventDefinitions().isEmpty()) {
                EventDefinition eventDefinition = startEvent.getEventDefinitions().get(0);
                if (!(eventDefinition instanceof MessageEventDefinition) &&
                        !(eventDefinition instanceof TimerEventDefinition) &&
                        !(eventDefinition instanceof SignalEventDefinition)) {
                    addError(errors, Problems.START_EVENT_INVALID_EVENT_DEFINITION,
                            process, startEvent,
                            "Unsupported event definition on start event");
                }
            }

        }
    }

    protected void validateMultipleStartEvents(List<StartEvent> startEvents, Process process, List<ValidationError> errors) {

        // Multiple none events are not supported
        List<StartEvent> noneStartEvents = new ArrayList<StartEvent>();
        for (StartEvent startEvent : startEvents) {
            if (startEvent.getEventDefinitions() == null || startEvent.getEventDefinitions().isEmpty()) {
                noneStartEvents.add(startEvent);
            }
        }

        if (noneStartEvents.size() > 1) {
            for (StartEvent startEvent : noneStartEvents) {
                addError(
                        errors,
                        Problems.START_EVENT_MULTIPLE_FOUND,
                        process,
                        startEvent,
                        "Multiple none start events are not supported");
            }
        }

    }

}
